How to assign exec's output to a property in NAnt

Question

My aim is to fill property with output of command "git describe". I have a property:

<property name="build.version" value = ""/>

And I want to fill it with output of the following command: git describe

I tried:

<exec program='${git.executable}' outputproperty='build.version'>
  <arg value='describe' />
</exec>

but unlike the Ant, NAnt doesn't support outputproperty :( only output (to file).

Answer 1

You're right. You have resultproperty attribute to hold the exit code and output attribute to redirect the output.

Why don't you redirect the output and load the file afterwards via loadfile task:

<target name="foo">
  <property
    name="git.output.file"
    value="C:\foo.txt" />
  <exec program="${git.executable}" output="${git.output.file}">
    <arg value="describe" />
  </exec>
  <loadfile
    file="${git.output.file}"
    property="git.output" />
</target>

Answer 2

Using trim, you can get rid of the carriage return character at the end. For instance, in the example above, add a line at the end to trim the string

<target name="foo">
  <property
    name="git.output.file"
    value="C:\foo.txt" />
  <exec program="${git.executable}" output="${git.output.file}">
    <arg value="describe" />
  </exec>
  <loadfile
    file="${git.output.file}"
    property="git.output" />

  <property name="git.ouput.trimmed" value="${string::trim(git.output)}" />

</target>